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73K224BL

更新时间: 2024-01-08 21:36:58
品牌 Logo 应用领域
TERIDIAN 调制解调器
页数 文件大小 规格书
33页 202K
描述
Single-Chip Modem w/ Integrated Hybrid

73K224BL 技术参数

生命周期:Obsolete零件包装代码:DIP
包装说明:DIP,针数:22
Reach Compliance Code:unknownHTS代码:8542.39.00.01
风险等级:5.04其他特性:FULL DUPLEX
数据速率:2.4 MbpsJESD-30 代码:R-PDIP-T22
长度:27.686 mm功能数量:1
端子数量:22最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:DIP封装形状:RECTANGULAR
封装形式:IN-LINE认证状态:Not Qualified
座面最大高度:5.08 mm标称供电电压:5 V
表面贴装:NO电信集成电路类型:MODEM
温度等级:INDUSTRIAL端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
宽度:10.16 mmBase Number Matches:1

73K224BL 数据手册

 浏览型号73K224BL的Datasheet PDF文件第26页浏览型号73K224BL的Datasheet PDF文件第27页浏览型号73K224BL的Datasheet PDF文件第28页浏览型号73K224BL的Datasheet PDF文件第30页浏览型号73K224BL的Datasheet PDF文件第31页浏览型号73K224BL的Datasheet PDF文件第32页 
73K224BL  
V.22bis, V.22, V.21, Bell 212A, 103  
Single-Chip Modem w/ Integrated Hybrid  
DATA SHEET  
DESIGN CONSIDERATIONS  
APPLICATIONS INFORMATION (continued)  
Semiconductor's one-chip modem products  
include all basic modem functions. This makes  
these devices adaptable for use in a variety of  
applications, and as easy to control as  
conventional digital bus peripherals.  
DIRECT ACCESS ARRANGEMENT (DAA)  
The DAA (Direct Access Arrangement) required for the  
73K224BL consists of an impedance matching  
resistor, telecom coupling transformer, and ring  
detection and fault protection circuitry.  
Unlike digital logic circuitry, modem designs must  
properly contend with precise frequency  
tolerances and very low level analog signals, to  
ensure acceptable performance. Using good  
analog circuit design practices will generally result  
in a sound design. Following are additional  
recommendations, which should be taken into  
consideration when starting new designs.  
The transformer specifications must comply with the  
impedance of the country in which the modem is being  
operated. Transformers designed specifically for use  
with the telephone network should be used. These  
may present a DC load to the network themselves (a  
“wet” transformer) or they may require AC coupling  
with a DC load provided by additional devices (a “dry”  
transformer). A dry transformer will generally provide  
higher performance and smaller size than a wet  
transformer. A wet transformer allows a simpler  
design, but must not saturate with the worst case DC  
current passing through it or distortion and poor  
performance will result.  
CRYSTAL OSCILLATOR  
The K-Series crystal oscillator requires a parallel  
mode (anti-resonant) crystal, which operates at  
11.0592 MHz. It is important that this frequency be  
maintained to within ±0.01% accuracy.  
The protection circuitry typically consists of a transient  
suppression device and current limiter to protect the  
user and the telephone network from hazardous  
voltages that can be present under fault conditions.  
The transient suppresser may be a MOV (metal oxide  
In order for a parallel mode crystal to operate  
correctly and to specification, it must have a  
capacitor connected to the junction of each of the  
crystal and internal inverter connections,  
terminated to ground. The values of these  
capacitors depend primarily on the crystal’s  
characteristics, and to a lesser degree on the  
internal inverter circuit. The values used affect the  
accuracy and start up characteristics of the  
oscillator.  
®
varistor), Sidactor (Teccor Electronics Inc.), spark  
gap device, or avalanche diode. Some devices clamp  
the transient to their specified break down voltage and  
others go into low impedance crowbar state. The latter  
require that the fault current cease before they can  
return to their inactive state.  
LAYOUT CONSIDERATIONS  
Current limiting devices can consist of a resistor,  
®
Raychem PolySwitch resettable fuse, or slow blow  
Good analog/digital design rules must be used to  
control system noise in order to obtain highest  
performance in modem designs. The more digital  
circuitry present on the PC board, the more this  
attention to noise control is needed. The modem  
should be treated as a high performance analog  
device. A 22 µF electrolytic capacitor in parallel  
with a 0.1 µF ceramic capacitor between VDD and  
GND is recommended. Liberal use of ground  
planes and larger traces on power and ground are  
also highly favored. High speed digital circuits tend  
to generate a significant amount of EMI (Electro-  
Magnetic Interference), which must be minimized  
in order to meet regulatory agency limitations. To  
accomplish this, high speed digital devices should  
be locally bypassed, and the telephone line  
interface and K-Series device should be located  
close to each other near the area of the board  
where the phone line connection is accessed. To  
fuse that can withstand the transient tests without  
permanent damage or replacement.  
Ring detection circuitry is not required by the FCC, but  
may be required by the application. The ring detector  
usually consists of an optoisolator, capacitor, and  
resistor to present the proper AC load to the network  
to meet the REN (Ring Equivalency Number)  
regulations of FCC Part 68. The K-Series Design  
Manual contains detailed information on the design of  
a ring detect circuits as well as the other topics  
concerning the DAA.  
Page: 29 of 33  
© 2005, 2008 TERIDIAN Semiconductor Corporation  
Rev 7.1  

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